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Thyra_DefaultDiagonalLinearOpWithSolve_def.hpp
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00002 // ***********************************************************************
00003 // 
00004 //    Thyra: Interfaces and Support for Abstract Numerical Algorithms
00005 //                 Copyright (2004) Sandia Corporation
00006 // 
00007 // Under terms of Contract DE-AC04-94AL85000, there is a non-exclusive
00008 // license for use of this work by or on behalf of the U.S. Government.
00009 // 
00010 // This library is free software; you can redistribute it and/or modify
00011 // it under the terms of the GNU Lesser General Public License as
00012 // published by the Free Software Foundation; either version 2.1 of the
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00015 // This library is distributed in the hope that it will be useful, but
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00017 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00018 // Lesser General Public License for more details.
00019 //  
00020 // You should have received a copy of the GNU Lesser General Public
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00027 // @HEADER
00028 
00029 #ifndef THYRA_DIAGONAL_LINEAR_OP_WITH_SOLVE_HPP
00030 #define THYRA_DIAGONAL_LINEAR_OP_WITH_SOLVE_HPP
00031 
00032 #include "Thyra_DefaultDiagonalLinearOpWithSolve_decl.hpp"
00033 #include "Thyra_DefaultDiagonalLinearOp.hpp"
00034 #include "Thyra_MultiVectorStdOps.hpp"
00035 #include "Thyra_VectorBase.hpp"
00036 #include "Thyra_TestingTools.hpp" // ToDo: I need to have a better way to get eps()!
00037 #include "Teuchos_Assert.hpp"
00038 
00039 
00040 namespace Thyra {
00041 
00042 
00043 // Constructors/initializers/accessors
00044 
00045 
00046 template<class Scalar>
00047 DefaultDiagonalLinearOpWithSolve<Scalar>::DefaultDiagonalLinearOpWithSolve()
00048 {}
00049 
00050 
00051 template<class Scalar>
00052 DefaultDiagonalLinearOpWithSolve<Scalar>::DefaultDiagonalLinearOpWithSolve(
00053   const RCP<const VectorBase<Scalar> >   &diag
00054   )
00055 {
00056   initialize(diag);
00057 }
00058 
00059 
00060 // protected
00061 
00062 
00063 // Overridden from LinearOpWithSolveBase
00064 
00065 
00066 template<class Scalar>
00067 bool
00068 DefaultDiagonalLinearOpWithSolve<Scalar>::solveSupportsImpl(
00069   EOpTransp M_trans) const
00070 {
00071   typedef Teuchos::ScalarTraits<Scalar> ST;
00072   return (ST::isComplex ? M_trans==NOTRANS || M_trans==TRANS : true);
00073 }
00074 
00075 
00076 template<class Scalar>
00077 bool
00078 DefaultDiagonalLinearOpWithSolve<Scalar>::solveSupportsSolveMeasureTypeImpl(
00079   EOpTransp M_trans, const SolveMeasureType& solveMeasureType) const
00080 {
00081   return this->solveSupportsImpl(M_trans); // I am a direct solver!
00082 }
00083 
00084 
00085 template<class Scalar>
00086 SolveStatus<Scalar>
00087 DefaultDiagonalLinearOpWithSolve<Scalar>::solveImpl(
00088   const EOpTransp transp,
00089   const MultiVectorBase<Scalar> &B,
00090   const Ptr<MultiVectorBase<Scalar> > &X,
00091   const Ptr<const SolveCriteria<Scalar> > solveCriteria
00092   ) const
00093 {
00094 
00095 #ifdef THYRA_DEBUG
00096   TEUCHOS_ASSERT(this->solveSupportsImpl(transp));
00097 #endif
00098 
00099   typedef Teuchos::ScalarTraits<Scalar> ST;
00100 
00101   assign(X, ST::zero());
00102   
00103   const Ordinal numCols = B.domain()->dim();
00104   SolveStatus<Scalar> overallSolveStatus;
00105 
00106   for (Ordinal col_j = 0; col_j < numCols; ++col_j) {
00107 
00108     const RCP<const VectorBase<Scalar> > b = B.col(col_j);
00109     const RCP<VectorBase<Scalar> > x = X->col(col_j);
00110 
00111     ele_wise_divide( ST::one(), *b, *this->getDiag(), x.ptr() );
00112 
00113   }
00114 
00115   SolveStatus<Scalar> solveStatus;
00116   solveStatus.solveStatus =
00117     (nonnull(solveCriteria) && !solveCriteria->solveMeasureType.useDefault()
00118       ? SOLVE_STATUS_CONVERGED : SOLVE_STATUS_UNKNOWN );
00119   solveStatus.achievedTol = SolveStatus<Scalar>::unknownTolerance();
00120   return solveStatus;
00121 
00122 }
00123 
00124 
00125 } // end namespace Thyra
00126 
00127 
00128 #endif  // THYRA_DIAGONAL_LINEAR_OP_WITH_SOLVE_HPP
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